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Article

Passive Flow Control for Drag Reduction on a Cylinder in Cross-Flow Using Leeward Partial Porous Coatings

Department of Mechanical, Manufacturing & Biomedical Engineering, Trinity College, University of Dublin, Parsons Building, Dublin 2, Ireland
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Author to whom correspondence should be addressed.
Current address: Centrica Business Solutions, Dublin 3, Ireland.
Academic Editor: Mahmoud Mamou
Fluids 2021, 6(8), 289; https://doi.org/10.3390/fluids6080289
Received: 14 June 2021 / Revised: 12 August 2021 / Accepted: 13 August 2021 / Published: 17 August 2021
(This article belongs to the Special Issue Convection in Fluid and Porous Media)
This paper presents a numerical study on the impact of partial leeward porous coatings on the drag of circular cylinders in cross-flow. Porous coatings are receiving increasing attention for their potential in passive flow control. An unsteady Reynolds-averaged Navier–Stokes model was developed that agreed well with the numerical and experimental literature. Using the two-equation shear stress transport kω turbulence model, 2D flow around a circular cylinder was simulated at Re = 4.2×104 with five different angles of partial leeward porous coatings and a full porous coating. For coating angles below 130, the coating resulted in an increase in pressure on the leeward side of the cylinder. There was a significant reduction in the fluctuation of the pressure and aerodynamic forces and a damping effect on vortex shedding. Flow separation occurred earlier; the wake was widened; and there was a decrease in turbulence intensity at the outlet. A reduction of drag between 5 and 16% was measured, with the maximum at a 70 coating angle. The results differed greatly for a full porous coating and a 160 coating, which were found to cause an increase in drag of 42% and 43%, respectively. The results showed that leeward porous coatings have a clear drag-reducing potential, with possibilities for further research into the optimum configuration. View Full-Text
Keywords: drag reduction; porous media flow; URANS CFD modelling; vortex shedding; k-ω SST drag reduction; porous media flow; URANS CFD modelling; vortex shedding; k-ω SST
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MDPI and ACS Style

Guinness, I.; Persoons, T. Passive Flow Control for Drag Reduction on a Cylinder in Cross-Flow Using Leeward Partial Porous Coatings. Fluids 2021, 6, 289. https://doi.org/10.3390/fluids6080289

AMA Style

Guinness I, Persoons T. Passive Flow Control for Drag Reduction on a Cylinder in Cross-Flow Using Leeward Partial Porous Coatings. Fluids. 2021; 6(8):289. https://doi.org/10.3390/fluids6080289

Chicago/Turabian Style

Guinness, Imogen, and Tim Persoons. 2021. "Passive Flow Control for Drag Reduction on a Cylinder in Cross-Flow Using Leeward Partial Porous Coatings" Fluids 6, no. 8: 289. https://doi.org/10.3390/fluids6080289

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